Pub Date : 2022-09-06DOI: 10.1109/Diagnostika55131.2022.9905118
V. Nikolić, P. Kadlec, R. Polanský, Wang Guanxiang, Benjamin C. K. Tee
An intrinsic self-healing material composed of poly-vinylidene-fluoride (PVDF) based fluoroelastomer with the addition of a small amount of non-ionic fluorinated surfactant was studied as a candidate material for electrical insulating purposes. Structural and thermal properties were analyzed with Fourier transform infrared spectroscopy and simultaneous thermal analysis. Broadband dielectric spectroscopy, volume and surface resistivity, and dielectric strength measurements provided a comprehensive overview of the dielectric properties. The material has a relatively high thermal stability (200 °C), a low dielectric strength of 13 kV/mm, and volume and surface resistivities of 1.07E+09 $Omegacdot$ cm and 1.94E+09 $Omega$, respectively. Due to various polarization effects, relative permittivity values are generally higher and increase with the loss factor at temperatures above 30 °c and at low frequencies (50 Hz). It was also found from high voltage testing that decomposition of the self-healing material was initiated by carbonization of the melt phase generated in the ignition area. Although a self-healing layer arises shortly after the destructive breakdown, the channel recovery activity is not consistent because of the material’s low viscosity. These initial results obtained on a novel dipole-dipole based self-healing material composite can serve as a reference point for further development – to reduce the overall polarity of the system and improve the dielectric properties, while maintaining its selfhealing ability.
{"title":"Assessing thermal and dielectric characteristics of healable, low-field illuminating optoelectronic stretchable material for electrical insulating purposes","authors":"V. Nikolić, P. Kadlec, R. Polanský, Wang Guanxiang, Benjamin C. K. Tee","doi":"10.1109/Diagnostika55131.2022.9905118","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905118","url":null,"abstract":"An intrinsic self-healing material composed of poly-vinylidene-fluoride (PVDF) based fluoroelastomer with the addition of a small amount of non-ionic fluorinated surfactant was studied as a candidate material for electrical insulating purposes. Structural and thermal properties were analyzed with Fourier transform infrared spectroscopy and simultaneous thermal analysis. Broadband dielectric spectroscopy, volume and surface resistivity, and dielectric strength measurements provided a comprehensive overview of the dielectric properties. The material has a relatively high thermal stability (200 °C), a low dielectric strength of 13 kV/mm, and volume and surface resistivities of 1.07E+09 $Omegacdot$ cm and 1.94E+09 $Omega$, respectively. Due to various polarization effects, relative permittivity values are generally higher and increase with the loss factor at temperatures above 30 °c and at low frequencies (50 Hz). It was also found from high voltage testing that decomposition of the self-healing material was initiated by carbonization of the melt phase generated in the ignition area. Although a self-healing layer arises shortly after the destructive breakdown, the channel recovery activity is not consistent because of the material’s low viscosity. These initial results obtained on a novel dipole-dipole based self-healing material composite can serve as a reference point for further development – to reduce the overall polarity of the system and improve the dielectric properties, while maintaining its selfhealing ability.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"125 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123305820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-06DOI: 10.1109/Diagnostika55131.2022.9905216
A. Pietrikova, T. Lenger, L. Livovsky, I. Vehec, Peter Lukacs
The authors discuss the comparison of two types of E-glass/epoxy sandwich structures for multi-layer PWB (Printed Wiring Boards) in relation to moisture absorption. Moisture diffusion characteristics based on measuring the mass change of l, 3, and 5 laminated layers were monitored at 40°C within multiple humidity tests at humidity levels from 5% RH to 85% RH. Based on the theoretically calculated time required for water absorption and desorption into epoxy samples filled with glass fibres, their absorption was experimentally confirmed depending on the thickness of the samples and also depending on the technology of their preparation (1 and 2 stage lamination of glass– epoxy laminated structure). From our experimental data, we obtained moisture saturation concentration at the humidity level from 5 % RH to 85% RH. The results of our analysis have shown that although epoxy constructions exhibit increased resistance to moisture penetration, it is not possible to completely prevent moisture inside these constructions. Ultimately, this should be taken into account when constructing packages with embedded components that cannot be considered to be hermetic. Our samples were exposed to S5 % moisture, while the moisture has been shown only in potential leaks among individual layers of pre-pregs sandwich, but also due to the saturation of the material itself, which is particularly activated along with the interface of samples. The results of the experiments can be used in creating multi-layer embedded sandwich structures, especially in terms of their reliability.
{"title":"Moisture Absorption of Glass-Epoxy Sandwich Structure","authors":"A. Pietrikova, T. Lenger, L. Livovsky, I. Vehec, Peter Lukacs","doi":"10.1109/Diagnostika55131.2022.9905216","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905216","url":null,"abstract":"The authors discuss the comparison of two types of E-glass/epoxy sandwich structures for multi-layer PWB (Printed Wiring Boards) in relation to moisture absorption. Moisture diffusion characteristics based on measuring the mass change of l, 3, and 5 laminated layers were monitored at 40°C within multiple humidity tests at humidity levels from 5% RH to 85% RH. Based on the theoretically calculated time required for water absorption and desorption into epoxy samples filled with glass fibres, their absorption was experimentally confirmed depending on the thickness of the samples and also depending on the technology of their preparation (1 and 2 stage lamination of glass– epoxy laminated structure). From our experimental data, we obtained moisture saturation concentration at the humidity level from 5 % RH to 85% RH. The results of our analysis have shown that although epoxy constructions exhibit increased resistance to moisture penetration, it is not possible to completely prevent moisture inside these constructions. Ultimately, this should be taken into account when constructing packages with embedded components that cannot be considered to be hermetic. Our samples were exposed to S5 % moisture, while the moisture has been shown only in potential leaks among individual layers of pre-pregs sandwich, but also due to the saturation of the material itself, which is particularly activated along with the interface of samples. The results of the experiments can be used in creating multi-layer embedded sandwich structures, especially in terms of their reliability.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115575485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-06DOI: 10.1109/Diagnostika55131.2022.9905159
M. Gutten, M. Kučera, D. Korenčiak, Martin Karman
In the article is description of the contactless and contact analysis of dry power transformers 800 kVA with epoxy insulation by acoustic camera and frequency impedance analyzer. Both methods are most often used for the analysis of components (mainly windings) of power transformers. Power transformers create acoustic and noise emissions, which can be used to analyze the transformer during operation. The paper presents an analysis of the solid collocation of the noise and acoustic spectrum. Experimental measurements and analysis have shown that noise and acoustic analysis can be a suitable measurement for the diagnosis of distribution dry-type transformers.
{"title":"Diagnostics of construction parts of the dry transformers","authors":"M. Gutten, M. Kučera, D. Korenčiak, Martin Karman","doi":"10.1109/Diagnostika55131.2022.9905159","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905159","url":null,"abstract":"In the article is description of the contactless and contact analysis of dry power transformers 800 kVA with epoxy insulation by acoustic camera and frequency impedance analyzer. Both methods are most often used for the analysis of components (mainly windings) of power transformers. Power transformers create acoustic and noise emissions, which can be used to analyze the transformer during operation. The paper presents an analysis of the solid collocation of the noise and acoustic spectrum. Experimental measurements and analysis have shown that noise and acoustic analysis can be a suitable measurement for the diagnosis of distribution dry-type transformers.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130881377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The most important component from the point of view of the life of each electrical equipment is its insulation system. The basic insulation of the electrical system is primary and secondary insulation. Primary insulation is the first insulation layer applied directly to the electric winding wire. Solvent varnishes are insulating materials of primary insulation and their role is in particular to provide electrical strength of the wire. Secondary insulation, often called as secondary impregnation, is the winding insulation process that follows primary insulation. It is a chemical process where the mechanical stability of the electrical windings increases by applying impregnants and insulated wires are protected against mechanical damage, moisture and other environmental influences. The role of impregnants in the winding of electrical machines is mainly the reinforcement of winding and heat removal. The influence of impregnant on the electrical insulating properties contributes significantly to the life of the insulation system with impregnant: compatibility with wire enamel, compatibility with other materials of insulation system according to construction and type of motor or transformer. The problem may also be the insufficient compatibility of the impregnant with the wire insulation. Therefore composition and processing of wire insulation has a significant impact on quality of impregnation.
{"title":"Method for evaluation of impregnant compatibility with lead-wire insulation","authors":"Filová Zuzana, Kozáková Alena, Kocúrová Katarína, Ďuračka Miroslav, Dérer Tomáš, Šištík Michal","doi":"10.1109/Diagnostika55131.2022.9905128","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905128","url":null,"abstract":"The most important component from the point of view of the life of each electrical equipment is its insulation system. The basic insulation of the electrical system is primary and secondary insulation. Primary insulation is the first insulation layer applied directly to the electric winding wire. Solvent varnishes are insulating materials of primary insulation and their role is in particular to provide electrical strength of the wire. Secondary insulation, often called as secondary impregnation, is the winding insulation process that follows primary insulation. It is a chemical process where the mechanical stability of the electrical windings increases by applying impregnants and insulated wires are protected against mechanical damage, moisture and other environmental influences. The role of impregnants in the winding of electrical machines is mainly the reinforcement of winding and heat removal. The influence of impregnant on the electrical insulating properties contributes significantly to the life of the insulation system with impregnant: compatibility with wire enamel, compatibility with other materials of insulation system according to construction and type of motor or transformer. The problem may also be the insufficient compatibility of the impregnant with the wire insulation. Therefore composition and processing of wire insulation has a significant impact on quality of impregnation.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"128 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124241961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-06DOI: 10.1109/Diagnostika55131.2022.9905142
C. Staubach, Sören Meissner
This paper presents the results of a master thesis done at the University of Applied Sciences of Hannover. In this study generator bars are aged mechanically and the aging process is investigated with the dielectric response analysis. The results indicate changes in different types of polarization mechanisms. Due to the small amount of measuring equipment needed – this can be a first step towards a fundamental change in condition base maintenance of generators.
{"title":"Potential and limitation of dielectric response analysis for mechanically aged VPI insulation","authors":"C. Staubach, Sören Meissner","doi":"10.1109/Diagnostika55131.2022.9905142","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905142","url":null,"abstract":"This paper presents the results of a master thesis done at the University of Applied Sciences of Hannover. In this study generator bars are aged mechanically and the aging process is investigated with the dielectric response analysis. The results indicate changes in different types of polarization mechanisms. Due to the small amount of measuring equipment needed – this can be a first step towards a fundamental change in condition base maintenance of generators.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115031569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-06DOI: 10.1109/Diagnostika55131.2022.9905121
N. Djagarov, G. Enchev, J. Djagarova
There is a need for diagnostics of the ship’s electrical equipment, which improves its operation and maintenance. The ship’s working conditions are very specific: metal hull, diesel power plant, powerful electric propulsion, the presence of various sources of disturbances. Development and implementation of ship systems for centralized control and diagnostics of perfect electrical equipment Ask in these systems for modeling of the induction machine, including damage to the rotor and the sideband, with minimal computational complexity. In known publications, mathematical models of induction motors are usually used, there is one specific damage. In our previous publications, a universal asymmetric mathematical model of an induction motor was proposed, allowing simulations of production emergency modes caused by damage in stator and rotor windings and in the mechanical part of the motor. In the article with the help of this universal model a broken rotor bar fault is simulated. An asymmetrically necessary mathematical model of the induction motor and a way to simulate this type of failure are shown. The obtained experimental results are introduced and analyzed with the help of the model.
{"title":"Simulation of Broken Rotor Bar Fault by Asymmetric Induction Motor Model","authors":"N. Djagarov, G. Enchev, J. Djagarova","doi":"10.1109/Diagnostika55131.2022.9905121","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905121","url":null,"abstract":"There is a need for diagnostics of the ship’s electrical equipment, which improves its operation and maintenance. The ship’s working conditions are very specific: metal hull, diesel power plant, powerful electric propulsion, the presence of various sources of disturbances. Development and implementation of ship systems for centralized control and diagnostics of perfect electrical equipment Ask in these systems for modeling of the induction machine, including damage to the rotor and the sideband, with minimal computational complexity. In known publications, mathematical models of induction motors are usually used, there is one specific damage. In our previous publications, a universal asymmetric mathematical model of an induction motor was proposed, allowing simulations of production emergency modes caused by damage in stator and rotor windings and in the mechanical part of the motor. In the article with the help of this universal model a broken rotor bar fault is simulated. An asymmetrically necessary mathematical model of the induction motor and a way to simulate this type of failure are shown. The obtained experimental results are introduced and analyzed with the help of the model.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122550946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-06DOI: 10.1109/Diagnostika55131.2022.9905102
H. Raja, H. Raval, T. Vaimann, A. Kallaste, A. Rassõlkin, A. Belahcen
A cost-efficient condition monitoring and fault diagnostic system are presented in this paper using the Internet of Things and machine learning. Most condition monitoring systems nowadays are either costly or used to monitor current values without emphasizing the analysis part. On the other hand, predictive maintenance of different electrical machines, including BLDC motors, is becoming the need of the hour. It reduces the cost needed for maintenance and can also be used to evade more significant faults in the machine. The data is transmitted in real-time using a data acquisition system onto the cloud, which is further processed to determine if there is a chance of any fault occurring in the motor. A short comparison of the results of different machine learning algorithms is also discussed related to predictive maintenance.
{"title":"Cost-efficient real-time condition monitoring and fault diagnostics system for BLDC motor using IoT and Machine learning","authors":"H. Raja, H. Raval, T. Vaimann, A. Kallaste, A. Rassõlkin, A. Belahcen","doi":"10.1109/Diagnostika55131.2022.9905102","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905102","url":null,"abstract":"A cost-efficient condition monitoring and fault diagnostic system are presented in this paper using the Internet of Things and machine learning. Most condition monitoring systems nowadays are either costly or used to monitor current values without emphasizing the analysis part. On the other hand, predictive maintenance of different electrical machines, including BLDC motors, is becoming the need of the hour. It reduces the cost needed for maintenance and can also be used to evade more significant faults in the machine. The data is transmitted in real-time using a data acquisition system onto the cloud, which is further processed to determine if there is a chance of any fault occurring in the motor. A short comparison of the results of different machine learning algorithms is also discussed related to predictive maintenance.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122275899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-06DOI: 10.1109/diagnostika55131.2022.9905161
{"title":"Diagnostika 2022 Cover Page","authors":"","doi":"10.1109/diagnostika55131.2022.9905161","DOIUrl":"https://doi.org/10.1109/diagnostika55131.2022.9905161","url":null,"abstract":"","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115976996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-06DOI: 10.1109/Diagnostika55131.2022.9905122
Jan Leffler, Lukáš Sobotka, Zdislava Mokrá, R. Pechánek, P. Trnka
Currently, a significant number of transformers are designed and used in the electricity distribution network. Since these machines are commonly based on an oil-paper electrical insulation system, it is crucial to know how certain important parameters of an oil behave within a wide range of ambient temperatures. Therefore, the range of temperatures should also include low temperature region as these conditions might occur in real application. The aim of this paper is to focus on the temperature dependent viscosity, density, thermal conductivity and specific heat of an oil in order to develop a strongly coupled thermal model of a transformer which is filled with biodegradable natural ester insulation fluid. Obtained results can be well applied within the design, operation and diagnostics phase of these types of electrical machines.
{"title":"Investigation of Natural Ester Insulating Fluid Properties and Thermal Model of a Transformer in Wide Temperature Range","authors":"Jan Leffler, Lukáš Sobotka, Zdislava Mokrá, R. Pechánek, P. Trnka","doi":"10.1109/Diagnostika55131.2022.9905122","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905122","url":null,"abstract":"Currently, a significant number of transformers are designed and used in the electricity distribution network. Since these machines are commonly based on an oil-paper electrical insulation system, it is crucial to know how certain important parameters of an oil behave within a wide range of ambient temperatures. Therefore, the range of temperatures should also include low temperature region as these conditions might occur in real application. The aim of this paper is to focus on the temperature dependent viscosity, density, thermal conductivity and specific heat of an oil in order to develop a strongly coupled thermal model of a transformer which is filled with biodegradable natural ester insulation fluid. Obtained results can be well applied within the design, operation and diagnostics phase of these types of electrical machines.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114691887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-06DOI: 10.1109/Diagnostika55131.2022.9905080
D. Korenčiak, M. Gutten, Martin Karman
In the article is description of the contact analysis of power transformers 22/0.4 kV with insulation oil-paper by time impact tester and frequency impedance analyzer. Both methods are most often used for the analysis of mechanical components (mainly windings) of power transformers. The diagnostic measurement allows finding fault state in transformer parts. Theoretical and experimental research at power transformer by frequency and time area is presented. Within analysis, mutual courses comparisons for both methods were performed using mathematical correlation methods. Thanks to this mathematical analysis, an interthread short circuit was found on the transformer primary winding.
{"title":"Comparison of time and frequency method in fault detection for transformer windings","authors":"D. Korenčiak, M. Gutten, Martin Karman","doi":"10.1109/Diagnostika55131.2022.9905080","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905080","url":null,"abstract":"In the article is description of the contact analysis of power transformers 22/0.4 kV with insulation oil-paper by time impact tester and frequency impedance analyzer. Both methods are most often used for the analysis of mechanical components (mainly windings) of power transformers. The diagnostic measurement allows finding fault state in transformer parts. Theoretical and experimental research at power transformer by frequency and time area is presented. Within analysis, mutual courses comparisons for both methods were performed using mathematical correlation methods. Thanks to this mathematical analysis, an interthread short circuit was found on the transformer primary winding.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123827527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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